Madison, WI to Nashville, TN buses and trains from $127

Or, see buses and trains from Nashville, TN to Madison, WI.
Here are some trips other travelers have found on Routefriend.
$127
20h 40m
3 stops
Amtrak Greyhound
$130
19h 50m
2 stops
Amtrak Greyhound
$?
13h 50m
1 stop
Amtrak Megabus